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x * [ 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 1 ] = 90
x * 45 = 90
x = 2
Bài làm :
\(a,23+x:2=37\)
\(x:2=14\)
\(x=14\times2\)
\(x=28\)
\(b,x-320:32=4\times16\)
\(x-10=64\)
\(x=64+10\)
\(x=74\)
\(c,3x-2018:2=23\)
\(3x-1009=23\)
\(3x=23+1009\)
\(3x=1032\)
\(x=344\)
\(d,\left(9x-21\right):3=2\)
\(9x-21=6\)
\(9x=6+21\)
\(9x=27\)
\(x=3\)
\(e,15:x+120:12=15\)
\(15:x+10=15\)
\(15:x=15-10\)
\(15:x=5\)
\(x=3\)
Học tốt nhé
a, 200 - 3( x - 16 ) = 20
3( x - 16 ) = 200 - 20 = 180
x - 16 = 180 : 3 = 60
x = 60 + 16 = 76
b, 5 + 10 + 15 + .............. + 95 + 100 + 105 = 1200
c, x + ( 99 - 97 + 95 - 93 + ............ + 7 - 5 + 3 - 1 ) = 100
x + ( 2 . 25 ) = 100
x + 50 = 100
x = 100 - 50 = 50
****, thks
\(\left(\frac{2011}{2012}+\frac{2012}{2013}+\frac{2013}{2014}\right)x0=0\)
#)Giải :
\(\left(\frac{2011}{2012}+\frac{2012}{2013}+\frac{2013}{2014}\right)\times\left(1+1\times2+1\times2\times3-9\right)\)
\(=\left(\frac{2011}{2012}+\frac{2012}{2013}+\frac{2013}{2014}\right)\times\left(1+2+6-9\right)\)
\(=\left(\frac{2011}{2012}+\frac{2012}{2013}+\frac{2013}{2014}\right)\times0\)
\(=0\)
#~Will~be~Pens~#
4xA=1x2x3x4+2x3x4x4+3x4x5x4+...+15x16x17x4
4xA=1x2x3x4+2x3x4x(5-1)+3x4x5x(6-2)+...+-15x16x17x(18-14)
4xA=1x2x3x4-1x2x3x4+2x3x4x5-2x3x4x5+3x4x5x6-...-14x15x16x17+15x16x17x18=15x16x17x18
=> A=15x4x17x18=18360
\(-8\cdot x-16+3\cdot x=1\cdot2\cdot3\)
\(\left(-8\cdot x+3\cdot x\right)-16=6\)
\(-5x=6+16\)
\(-5x=22\)
\(x=-\frac{22}{5}\)